31998158 has 16 divisors (see below), whose sum is σ = 48660480. Its totient is φ = 15779736.

The previous prime is 31998157. The next prime is 31998173. The reversal of 31998158 is 85189913.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31998151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66563 + ... + 67041.

It is an arithmetic number, because the mean of its divisors is an integer number (3041280).

Almost surely, 2^31998158 is an apocalyptic number.

31998158 is a deficient number, since it is larger than the sum of its proper divisors (16662322).

31998158 is a wasteful number, since it uses less digits than its factorization.

31998158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871.

The product of its digits is 77760, while the sum is 44.

The square root of 31998158 is about 5656.6914358130. The cubic root of 31998158 is about 317.4741186252.

The spelling of 31998158 in words is "thirty-one million, nine hundred ninety-eight thousand, one hundred fifty-eight".